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Upon graduating from extermination school, Slip Mahoney (Leo Gorcey), his friend Sach (Huntz Hall) and their buddies are sent to wipe out the bugs in an isolated mansion. Frightened by the odd sounds, flashing lights and mysterious writing on the walls, Slip and the boys are relieved when their friend Gabe (Gabriel Dell) and his new wife join them. Unknown to the group, the mansion is being used by obsessed Dr. Coslow (Douglas Dumbrille) to conduct weird experiments with unwitting prisoners. Wikipedia